Alec Baldwin has reprised in his role as Donald Trump for the latest episode of Saturday Night Live’s Weekend Update, identifying the US president as the true martyr of the tragic Charlottesville rally.

A 12-year-old singing ventriloquist has been awarded US$1 (A$1.3) million prize and her own Las Vegas show after taking the America's Got Talent crown on the season 12 finale of the NBC reality competition.

A Brazilian construction firm has admitted that a "cartel" of firms fixed bidding for contracts to do work on stadiums for the 2014 football World Cup, Brazilian authorities have revealed.

Brazilian antitrust authorities said the probe was linked to the Petrobras corruption scandal, which has snared numerous Brazilian politicians.

"There is evidence that at least five public calls for tender linked to work on World Cup stadiums were subject to a cartel," the Administrative Economic Defense Council (CADE), a Brazilian antitrust body, said in a statement.

CADE said construction firm Andrade Gutierrez had confessed to the cartel activity after agreeing to cooperate with investigators in return for being spared sanctions.

Rio de Janeiro's Maracana Stadium and the Arena Pernambuco in Recife were among the stadiums involved in the scandal which took place between 2007 and 2011.

CADE said the probe was an offshoot of Operation Car Wash, a major investigation by prosecutors into a $2 billion corruption scandal at Petrobras oil firm.

The scandal sparked the resignation of several ministers in President Michel Temer's government.